package com.mzj.mzjaicodemother.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.math.MathUtil;
import cn.hutool.core.util.StrUtil;
import com.mybatisflex.core.query.QueryWrapper;
import com.mybatisflex.spring.service.impl.ServiceImpl;
import com.mzj.mzjaicodemother.exception.BusinessException;
import com.mzj.mzjaicodemother.exception.ErrorCode;
import com.mzj.mzjaicodemother.model.dto.user.UserQueryRequest;
import com.mzj.mzjaicodemother.model.entity.User;
import com.mzj.mzjaicodemother.mapper.UserMapper;
import com.mzj.mzjaicodemother.model.enums.UserRoleEnum;
import com.mzj.mzjaicodemother.model.vo.user.LoginUserVO;
import com.mzj.mzjaicodemother.model.vo.user.UserVO;
import com.mzj.mzjaicodemother.service.UserService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.mzj.mzjaicodemother.constant.UserConstant.USER_LOGIN_STATE;

/**
 * 用户 服务层实现。
 *
 * @author 梅子酒
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>  implements UserService{

    /**
     *
     * @param userAccount 账户
     * @param userPassword 密码
     * @param checkPassword 再次确认密码
     * @return 用户id
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        //1.验证接收到的相关参数
        if (StrUtil.hasBlank(userAccount,userPassword,checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"输入的参数为空");
        }

        if (userPassword.length()<8 || checkPassword.length()<8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码长度过短");
        }

        if (userAccount.length()<5){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号的长度过短");
        }

        if (!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次输入的密码不一致");
        }
        //2.查询数据库内是否存在(利用mybatis flex)
        QueryWrapper queryWrapper=new QueryWrapper();
        queryWrapper.eq("userAccount",userAccount);
        long count=this.mapper.selectCountByQuery(queryWrapper);
        if (count>=1){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复了");
        }

        //3.给用户输入的密码进行加密处理
        String encryptPassword = getEncryptPassword(userPassword);
        //4.将数据存入数据库中
        User user=new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("用户");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean save = this.save(user);
        if (!save){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"注册失败,数据库错误");
        }
        return user.getId();

    }

    /**
     * 密码加密
     * @param userPassword
     * @return
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        final String SALT="mzj";
        return DigestUtils.md5DigestAsHex((userPassword+SALT).getBytes(StandardCharsets.UTF_8));
    }


    /**
     * 登录
     * @param userAccount  用户账户
     * @param userPassword 用户密码
     * @param request 用于登陆时更新session
     * @return 过滤后的用户信息
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.校验
        if (StrUtil.hasBlank(userAccount,userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号或密码为空");
        }

        if (userPassword.length()<8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"密码长度过短");
        }

        if (userAccount.length()<5){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号的长度过短");
        }

        //2.加密
        String encryptPassword=getEncryptPassword(userPassword);

        //3.查询用户是否存在（利用queryWrapper）
        QueryWrapper queryWrapper=new QueryWrapper();
        queryWrapper.eq("userAccount",userAccount);
        queryWrapper.eq("userPassword",encryptPassword);
        User user = this.mapper.selectOneByQuery(queryWrapper);
        if (user == null){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号或密码错误");
        }

        //4.记录用户的登录态
        request.getSession().setAttribute(USER_LOGIN_STATE,user);

        //返回过滤后的用户信息
        return this.getLoginUserVO(user);
    }

    /**
     * 获取当前登录的用户信息
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        //判断用户是否登录
        Object attribute = request.getSession().getAttribute(USER_LOGIN_STATE);
        User user=(User) attribute;
        if (user == null || user.getId() == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        //查询用户信息（从数据库中）
        Long id = user.getId();
        User byIdUser = this.getById(id);
        if (byIdUser == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return byIdUser;
    }

    /**
     * 用户注销
     * @param request
     * @return
     */
    @Override
    public boolean userLogout(HttpServletRequest request) {
        //1.判断用户是否登录
        Object attribute = request.getSession().getAttribute(USER_LOGIN_STATE);
        User user=(User) attribute;
        if (user == null || user.getId() == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        //2.移除登录态
        request.getSession().removeAttribute(USER_LOGIN_STATE);
        return true;
    }

    /**
     * 返回脱敏后的用户信息（查看别人信息）
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVO(User user) {
        if (user==null){
            return null;
        }
        UserVO userVO=new UserVO();
        BeanUtil.copyProperties(user,userVO);
        return userVO;
    }


    /**
     * 查看集合用户信息
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    /**
     * 将请求对象转化为queryWrapper便于mybatisFlex进行查询
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        return QueryWrapper.create()
                .eq("id", id)
                .eq("userRole", userRole)
                .like("userAccount", userAccount)
                .like("userName", userName)
                .like("userProfile", userProfile)
                .orderBy(sortField, "ascend".equals(sortOrder));
    }



    /**
     * 返回过滤后的已登录用户信息（查看个人信息）
     * @param user
     * @return
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user==null){
            return null;
        }
        LoginUserVO loginUserVO=new LoginUserVO();
        BeanUtil.copyProperties(user,loginUserVO);
        return loginUserVO;
    }
}
